Which of the following SQL statements determines how many total customers were referred by other customers? (refer to the tables in the JustLee Books database.)a. SELECT customer#, SUM(referred)FROM customersGROUP BY customer#;b. SELECT COUNT(referred)FROM customers;c. SELECT COUNT(*)FROM customers;d. SELECT COUNT(*)FROM customersWHERE referred IS NULL;

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Multiple Table

In a database, a table is used to store data in the form of rows and columns. Rows are aligned horizontally and identified by one or more values in a specific column. Columns are vertically aligned and identified by a unique column name.